Function ff_hwframe_map_create

libavutil/hwcontext.c:741–791

}

int ff_hwframe_map_create(AVBufferRef *hwframe_ref,
                          AVFrame *dst, const AVFrame *src,
                          void (*unmap)(AVHWFramesContext *ctx,
                                        HWMapDescriptor *hwmap),
                          void *priv)
{
    AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
    HWMapDescriptor *hwmap;
    int ret;

    hwmap = av_mallocz(sizeof(*hwmap));
    if (!hwmap) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    hwmap->source = av_frame_alloc();
    if (!hwmap->source) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }
    ret = av_frame_ref(hwmap->source, src);
    if (ret < 0)
        goto fail;

    hwmap->hw_frames_ctx = av_buffer_ref(hwframe_ref);
    if (!hwmap->hw_frames_ctx) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    hwmap->unmap = unmap;
    hwmap->priv  = priv;

    dst->buf[0] = av_buffer_create((uint8_t*)hwmap, sizeof(*hwmap),
                                   &ff_hwframe_unmap, ctx, 0);
    if (!dst->buf[0]) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    return 0;

fail:
    if (hwmap) {
        av_buffer_unref(&hwmap->hw_frames_ctx);
        av_frame_free(&hwmap->source);
    }
    av_free(hwmap);
    return ret;
}

int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags)
{